Telephone-receiver.



HL M. SCHNEIDER.

TELEPHONE REcEwER. APPLICATION FlLED-MAR. 13, 1914.

Patented Apr. 27, 1915.

HUGo H. SCHNEIDER, or SEATTLE, wnsHINGToN.:

TELEPHONE- RECEIVER.

Specication of Letters Patent.

Patented Apr. 2'7, 1915.

Application led March 13, 1914. Serial No. 824,438.

' To all 'whom 'it may concern:

lso

Be it known that I, HUGoH. SCHNEIDER,

a citizen of the United States, residing at Seattle, in the county of King and State of Washington, have invented certain new and useful Improvements in Telephone-Receivers, of which the following is a specification.

This invention relates in general to telephones lof the class Awhich are operated by the aid of an electric current, andil more particularly to the .diaphragm and its accessories in a telephone receiver.

The object of the invention is toimprove telephonie articulation. Y

To this end'my invention consists in the construction and combination of parts forming a telephone receiver hereinafter more fully described, and definitely stated in the -claims, reference being had to the accompanying drawings, in which:

Figure 1 represents my invention in telephone receivers in side view, partly broken away, and a'diagram of a single phase, alternatin current-generator. Fig. 2 -shows a modi cation of the same.l

vNumeral 1 represents thev diaphragm of my telephone recelver of any suitable material having a permanent magnet 2 attached to it.

N may be considered the north or posi- Ative pole, and S the south-or negative ole of this magnet. A core 3 of soft ironere shown in horseshoe shape-is located with its ends-4 and 5 opposite to the poles N and S, respectively.

he two arms 4'and 5 are WoundV in anyV usual manner to form Aa magnet when vitalized, and for the latter purpose a source 6 of alternating current electricity is connected by wires 7 and 8 with the coils 4 and 5. In operation, when the alternating current comes in, or is positive, at pole 5, the

adjacent negative pole S of the diaphragmv will thereby be'attracted, and at the same time the pole 4 will be negative and will consequently attract the positive .pole N of thniiaphragm but the succeeding alternate impulse of the current will reverse the ac- .'tin,making pole 4 positive and pole 5 negative-1 whereby, the polarity being v now the same as the adjacent poles N and S, the diaphragm will be repelled. A stretched string is one of or diaphragm, if set to vibrating freely,

swings to and fro across its normal line or plane o f rest. In the primitive telephone comprlsmg two diaphragms with a taut s'trlng connecting their centers the diaphragms were 'so strained that the normal form vwas a cone, and the constant pull in one direction did not permit Vibration beyond the limit of they string. This, I think, y the reasons why the articulation of the string telephone and I think that a similar resultis produced, thoughl in a lesser degree, in the class of telephonesl which use a magnet in connection with the diaphragm, but arrange the magnet to exert only an attracting or pulling iniiuence. Therefore, I `employ a magnet both the outward and inward undulations of sound waves. By this means the vibrations of the diaphragm in reproducing ar-4 l ticulate sounds-will be assisted both to and fro, rendering the quality of the -sound reproduced more nearly perfect.

In the modification shown in Fig-2 a soft ironcore 10, provided with the usual windings l1 and 12, is fixed to the diaphragm 9, and is connected by means of wires 1'4 and 15 with a source 13 of alterc nating current, and the' action of the diaphragm is like that described in Fig. 1. In Fig. 1 the diaphragm carries a magnetic field the direction of which is fixed, and in Fig. 2 the diaphragm carries a magnetic eld the direction of which is reversible by the action of the alternating current. AIt

may be found practicable to make the dia'- phragm 1 in Fig. l a permanentmagnetic disk and dispense with the attached part 2.

service."

I cla/imi 1.11111 a telephonereceiver, a diaphragm,

was very imperfect, j

a' permanent magnet secured theretof;. an

electro-magnet located with its two poles adjacent to the poles of the permanent magnet; and asource of alternating lectric cury lnmted adiacent one te the .fv'her to cenet,

and a diaphragm Carrying one of the said 1o magnets.

In testimony whereof I aix my signature in presence of two Witnesses.

HUGO H. SCHNEIDER.

Witnesses: e

R'. E. CRYDER, H. L. THOMPSON. 

